MCQ - CBSE Class 9 Science Explain how human ear works in the transmission of sound wave to the brain. 10/04/2023 Ajit kumar 93 Views 0 Comments Read more
MCQ - CBSE Class 9 Science What is ‘Ultrasound’? Explain how defects in a metal block can detected using ultrasound. 10/04/2023 Ajit kumar 100 Views 0 Comments Read more
MCQ - CBSE Class 9 Science What does the acronym SONAR stand for? 10/04/2023 Ajit kumar 104 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Even if a loud explosion were to take place at any place on the moon, it would not be heard at a nearby point. Give reason. 10/04/2023 Ajit kumar 77 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Why the stage of an auditorium has curved background, curtains, carpets and false ceiling? 10/04/2023 Ajit kumar 86 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Why the astronauts talk to each other through radio telephone ? 10/04/2023 Ajit kumar 80 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Give four practical uses of ultrasonic vibrations. 10/04/2023 Ajit kumar 76 Views 0 Comments Read more
MCQ - CBSE Class 9 Science State three conditions necessary for sound to be heard. 10/04/2023 Ajit kumar 101 Views 0 Comments Read more
MCQ - CBSE Class 9 Science A continuous disturbance is created on the surface of water in a ripple tank with a small piece of cork floating on it. Describe the motion of cork. What does it tell about the disturbance ? 10/04/2023 Ajit kumar 83 Views 0 Comments Read more
MCQ - CBSE Class 9 Science What is Galton’s whistle? To what use it can be put ? 10/04/2023 Ajit kumar 104 Views 0 Comments Read more